Belt-tiahti



APPLICAUUN FILED JAILZI. i918.

Patented Dec. 27, 1921.

ATTORNEY.

UNITED STATES] PATENT orrlcs.

cnsnLss 1.. mesons; ornnnn'om mcmqmg ASSIGNOB, a! mussels, TO THE Isxocomm, or 01110100. rumors, n sources-non ornmwm BELT-maximise its-011mm.

s ec fication: Letters Patent. fiatentedDec. 27, 1921.

i ucanmi and Ianusry 21, win. mm mm clams.

To all whom it may concern;

Be it known that I, Came L. MoCmnz,

,a citizen of the United States, and resident .nisms, o'f which thefollowing is a 'epecific'a-.

'tion. This invention relates to belt ti htening mechanism andparticularly toi teautw.

matic type of such mechanism. In the single illustrative form of theintention, herein shownit is applied to the mechanism between anelectric motor enda'compressor rating apparat' but it is not limited tot at particuar app ication.

In the use of the usual belt tightens! involving a yieldingly mountedvibrating pulicy in a driving mechanism of the form above referred to,it has been found that explify the construction of 'automutic beltcessive vibration of the pulley took place due in part to the uneveninipu ses of the compressor, and this vibration caused the lubricatingoil of the pulley to be thrown from its shaft thus making necessary moreire uent oiling and resulting in u very dirty mac line. This objectionmade such belt ti htencrs prohibitive for apparatus. to be user inconnection with domestic refrigerators.

One of the objects of the present invention is to prevent theharmfu'lvibrution of the pulley of n belt tightening mcchunism and thusretain the oil in the bearings.

Another object of the invention is-to sinitightening mechanisms and torender them more efficient.

- Other objects of the invention will appealifrom thefollowing'description taken in umnection with the drawings,'whic h forma part of this specification, and in which:

Figure lie 11 side elevation of a inutor and compressor drivingmechanism with u bolt tightenin mechanism embodying my inven tionapplied thereto;

Fig. 2 is a plan view of Fig. l; and

Fig. 3 is u fragmentary perspective view of the ratchet and springtightening devices.

Referring to the drawings. 10 represents an electric motor hsviu g udriving pulley 11, and 12 is a compressor having a large driven ulley13. A driving belt connects the .upwsrdly by the spring pulleys 11 and13, whereby the compressor is driven by the motor. The com ressor 12comprises a frame or base 15 which may form the sup rt for the belttightening mechanism. Sal mechanism comprises a spin 'ng arm 16 basin apulley 17, a stationary racket 18 3 rec bar 19, and a spri 20. The amit) is so mounted that its pu e. 17 bears against the belt 14to'uutomatica l tighten the latter by taking up the slack. he arm isyieldingly swung 90 extending between it'and the'braoket 18, the tensionof the spring being regulated by-the thumb nut 21 as is clear from Figs.1 and 3.

Vibration of the pulley 17 or retraction of the arm 16 is prevented'bythe rack bar 19, the ratchet teeth 22 of which bear against the bracket18. Said rack bar is pivoted to the arm 16 at 23 and extends through aslot 24 in the bracket 18, and the spring 20, in-' stead of beingconnected directly to the urn: 16, has. its lower end secured to ulateral finger 25 near the lower end of the bur thus making the lmr andspring substantially parallel. liy this arrangement the springlltWlt'l'. 20 is common to the tightenor mechanism and theretniningdevico, or in other words, the spring 20 opcrutcs the arm 16 toyieldingly hold the pulley 17 against the bolt, and at the same time ituctuutes the ratchet, keeping the teeth 22 in yielding contact with thebracket 18, so that as the belt stretches and the arm 16 is movedupwardly slightly, the ruck bur ll) retains it and pre vents the pulley17 fmm vibrating and throwing tlmoil.

it will be understmxl thutmy invention is not limited to the dctuils ofconstruction .stati'on-arv bracket, and .mesns connecting,

pulley with the bracket to automatisition. and fetainitfin-such-positi'dn belt,

cally moye thepull y toward tightening po- 3. The combination with adriviri of-a tightening pulley bearing thereon, a

ratchet'device cbnfn'ected to said pulley,- and of a tightening pulley,means to move the pulley toward tightening position, and means to retainthe pulley in such position,

a single spring device forming part of both belt,

sa d means. L

.fin'lhefcoiiibination with a drivi of'automaticmeans for tighteningsaid belt and retaining it so tightened, said means cludinl a sinlespring only.

6. T e'clom inationrwith' a driving belt, ofautomatic meansfor-tightening said belt, and a ratchet device for retaining said means,said means and said device havinga common operating spring.

7. The combination w th a driving belt, ofra tightening pulley, a springfor operat, ing said pulley, and a ratchet device to prevent returnaction of the pulley, said device being actuated by said spring.

8. In a belt driving mechanism, the combinationwith a driving pulley, adriven pfilley,'and a belt connecting said pulleys, of a tighteningp'ulley, a swinging arm for the latter pulley, a ratchet device for saidrarm, and a s ringcqnnected to operate said arm and sai device;

9, In a, belt driving mechanism, the combination with a driving pulley,a driven pulley,. 'and a belt connecting said pulle s, of a tighteningpulley, a swingin' arm or the latter pulley, a bracket, a rim barconnected to. said arm and operating against said bracket, and a springso connected to said bar and bracket as to operate said arm towardtightening position and retain said bar against said bracket.

-10. In abelt driving mechanism, the combination with a driving pulley,a driven 'puIley,-and a belt connecting said pulleys,

of a tightening pulley, a swinging arm for the latteii pullem'a bracket,a rack bar pivoted to thclirm and operating with its rack against saidbracket, said bar having a lateral finger, and a spring'extendin fromsaid bracket .tesaid finger to draw t e arm toward saidbra 'cketandretain the rack bar against said ,l2.r cket.

11. In'dibeltdriving mechanism, the c0mb'ination' with a driving pulley,a driven pulley, and. a belt connecting said pulle's, of a tighteningpulley, a swingin arm or the -latter pulley, a bracket, a rite barpivoted to the arm and operating with its rack against said bracket,said bar having a lateral finger, and a spring extending from saidbracket to said finger substantially arallel to said rack bar to drawthe arm tif ward said bracket and retain the rack bar against saidbracket.

CHARLES L. MQCUEN.

' In testimony whereof affix my signatnreiiii

